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SCS Series Manual —
P/N 15712:L 7/18/16
175
HVAC Wiring Diagrams
Ratings and Wiring Diagrams
Figure 5.66 Motorized Damper Control - HVAC Switch Group Type 15
Figure 5.66 depicts a motorized damper in an HVAC system with the capability of
OPEN
and
CLOSED
control and verification of the
OPEN
and
CLOSED
state, switch group type 15. In the above configuration, the CON
ON⁄OP
CM is activated and the CON
OFF⁄CL
CM is deactivated. Under
normal operation (non-smoke control mode) both control modules would be deactivated, allowing the EMS system to freely control the
damper. The CON
ON⁄OP
CM controls two contactors: a normally closed contactor for the damper closed power line, and a dual normally
open/normally closed contactor for the damper open power line. The CON
OFF⁄CL
CM controls two contactors: a normally closed contactor
for the damper open power line, and a dual normally open/normally closed contactor for the damper close power line. When the
CON
ON⁄OP
CM is activated, the CON
OFF⁄CL
CM is deactivated and vice versa. When the CON
ON⁄OP
CM is activated, the normally closed con-
tactor is opened (cutting any power supplied by the EMS to the damper closed power line), the normally closed portion of the dual contactor
is opened (cutting any power supplied by the EMS to the damper open power line), and the normally open portion of the dual contactor is
closed, thus supplying power to open the damper.
When power is supplied to the damper open power line, the damper opens. When the damper completely opens, the damper open limit
switch is
CLOSED
and the damper closed switch
OPENS
, indicating that the damper is in the
OPEN
position. The VER
ON⁄OP
MM monitors the
CLOSED
position of the damper open limit switch and the VER
OFF⁄CL
MM monitors the
CLOSED
position of the damper closed limit switch. In
this case the VER
ON⁄OP
MM is activated and the VER
OFF⁄CL
MM is deactivated because the damper is
OPEN
.
Power Source
Damper
Open
Power
ELR-47K
(use 3.9K listed ELR with FZM-1)
N/O
COM
Power Return
Listed
24 VDC
Power Source
FMM-1
DM
O
-h1
5a
-fs-2
.wmf
SLC Loop
CON
ON/OP
CM
(activated)
VER
OFF/CL
MM
(deactivated)
Limit Switch
for closed
position
Damper
Closed
Power
AC
MOTOR
DAMPER
OPEN
FCM-1
FCM-1
CON
OFF/CL
CM
(deactivated)
1a, 1b listed contactor
1b listed
contactor
Energy
Management
System
1b listed contactor
1b, 1a
listed
contactor
FMM-1
VER
ON⁄OP
MM
(activated)
N/O
COM
Limit Switch
for open
position
*If the SLC device
does not match the
one in this figure,
refer to the SLC
manual appendix,
which contains
wiring conversion
charts for type V
and type H
modules.